Thanks for posting your query on this website. I can fully appreciate your concern for your problem.
I fail to understand why your doctor did not order for sputum culture
and sensitivity test, to isolate the culprit organism and short-list the antibiotics to which the grown organism was sensitive to.
Ask the treating doctor to get the above-mentioned sputum test done and treat your father with only those antibiotics found to be effective in killing the culprit organism.
I am confident that you will certainly benefit from the advice.
May I assure you that I am always available for your assistance and will try my best to cure your condition to the best of my experience and knowledge.
Please feel free to revert back to me in case of further clarifications, if any.
HAVE A NICE DAY AND A SPEEDY RECOVERY.
Dr.(Col) R Karanwal